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I realize this is a very old answer, but it's worth noting that the above answer includes something very important that this one does not. There is a very important distinction between a "creature" and a "creature card." A "creature" is a permanent on the battlefield; that is what had infect. Corpse Cur can only target a "creature card with infect", and the Vector Asp card doesn't have infect, whether or not it could represent a creature that does.
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GendoIkariOct 9 '13 at 3:34